Debate is raging on internet message boards over whether Madonna's "rocking" Live Earth performance owed more to technical wizadry than musical talent.
Madonna at Live Earth: It was rocking, but was it real?
Millions of people around the world saw the American singer, not known for her strumming skills, wrap a guitar strap around her neck and play along to her hit Ray of Light on Saturday night.
The packed Wembley Stadium crowd loved the unexpected flourish, but cynics have suggested that Madonna may not have actually been playing the instrument.
The Queen of Pop has, apparently, been taking lessons, but gossips have questioned whether she is yet sufficiently proficient to perform live.
"Was that real?", asked Spotnick on the music website Neworderonline.com
It has also been claimed that the length of Madonna's fingernails would make it impossible to play the guitar properly, although a close inspection of photographs from the show reveal she had them closely clipped for the occasion.
Other music fans have suggested that the slightly amateurish sound was proof enough that it was a genuine live show.
Junglejungle wrote on the Yahoo message board: "She did a few mistakes also.. her timing was out... perhaps she should stick to singing."
Others were more impressed. "I've never seen Madonna play an electric guitar before - she thinks she's Jimi Hendrix - you have to see the feedback trick she did at the end of the first song," said DudeAsInCool on the BeatKing music website.
Kurtlives on the GuitarZone message board said: "The playing wasn't tough but the fact she played surprised and impressed me. Like most pop singers of today dont write or even play any instruments on their tunes."